Specific features of photorespiration in photosynthetically active organs of C3 plants

Balaur, Nicolae; Воронцов, В. А.; Merenyuk, L. F.

doi:10.1134/s1021443713020039

Cited by 3 publications

(1 citation statement)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This is especially pronounced in the ear, where the inclusion of 14 C in the products of glycolate metabolism is twice as much as in the leaves and the stem (Table 2). But, as was shown [13], photorespiration does not appear in gas exchange in the non-leaf organs of cereal plants. It is likely that in these organs the products of glycolate metabolism are being export compounds and their formation is not associated with oxygenase photorespiration (oxygen uptake and CO2 emission), but with an excess of the chloroplast's reducing force (the transketolase mechanism of glycolate formation) and use of the produced amino acids (via glycolate) during protein synthesis in acceptor organs.…”

Section: Methodsmentioning

confidence: 60%

Participation of stem and ear photosynthesis in formation of the crop and its quality in wheat

Chikov

Akhtyamova

2020

BIO Web Conf.

View full text Add to dashboard Cite

Photosynthesis of various organs and their contribution to formation of ear caryopsis were measured using14CO2 labeled carbon in the phase of caryopsis formation of spring wheat plants (Moskovskaya-35). It turned out that inclusion of14C into amino acids is more than twice as high in photosynthesis of an ear. Among labeled low molecular weight compounds in caryopsis, during a short exposure (2 hours) after photosynthesis, the most of the labeled carbon in the14CO2 was found from the photoassimilates of the flag leaf (70.4%); from the ear (55.8%), and the least – from the stem under the flag (41.5%). The difference in inclusion of14C into the caryopsis’ total proteins was observed only with a short exposure of the photosynthesizing organ (2 hours). Water-soluble proteins, as products of photosynthesis of the flag leaf, were synthesized for the most in the caryopsis (flag – 73.9%; stem – 46.4% and ear – 44.8%), and in the synthesis of complex proteins, which are soluble in alkali and Triton X-100, most of14C was from the products of photosynthesis of non-leaf organs (10.5; 21.5; 28.4 and 4.3; 12.5; 13.4), respectively.

show abstract

Section: Methodsmentioning

confidence: 60%

Participation of stem and ear photosynthesis in formation of the crop and its quality in wheat

Chikov

Akhtyamova

2020

BIO Web Conf.

View full text Add to dashboard Cite

show abstract

Transport and Metabolism of Nitrogen in Legume Nodules Under Phosphorus Deficiency

Babar

Zaidi

Ali

et al. 2017

Legume Nitrogen Fixation in Soils With Low Phosphorus Availability

View full text Add to dashboard Cite

Ear photosynthesis in C3 cereals and its contribution to grain yield: methodologies, controversies, and perspectives

Tambussi

Maydup

Carrión

et al. 2021

Journal of Experimental Botany

View full text Add to dashboard Cite

In C3 cereals such as wheat and barley, grain filling was traditionally explained as being sustained by assimilates from concurrent leaf photosynthesis and remobilization from the stem. In recent decades a role for ear photosynthesis as a contributor to grain filling has emerged. This review will analyze several aspects of this topic: (i) methodological approaches for estimation of ear photosynthetic contribution to grain filling; (ii) the existence of genetic variability in the ear contribution, and evidence of genetic gains in the past; (iii) the controversy about the existence of C4 metabolism in the ear; (iv) the response of ear photosynthesis to water deficit; and (v) morphological and physiological traits possibly related to ear temperature and thermal balance of the ear. The main conclusions are: (i) there are a number of methodologies to quantify ear photosynthetic activity (e.g. gas exchange, chlorophyll fluorescence) and the ear contribution to grain filling (individual ear shading, ear emergence in shaded canopies, isotope composition); (ii) the contribution of ear photosynthesis seems to have increased in modern wheat germplasm; (iii) the ear contribution to grain filling increases under resource-limitation conditions (water deficit, defoliation, pathogen infection); (iv) there is genetic variability in the ear contribution in wheat, opening the possibility to use this trait to ameliorate grain yield; (v) current evidence supports the existence of C3 metabolism rather than C4 metabolism; (vi) the ear is a ‘dehydration avoider organ’ under drought; (vii) thermal balance in the ear is a relevant issue to explore, and more research is needed to clarify the underlying morphological and physiological traits.

show abstract

Specific features of photorespiration in photosynthetically active organs of C3 plants

Cited by 3 publications

References 12 publications

Participation of stem and ear photosynthesis in formation of the crop and its quality in wheat

Participation of stem and ear photosynthesis in formation of the crop and its quality in wheat

Transport and Metabolism of Nitrogen in Legume Nodules Under Phosphorus Deficiency

Ear photosynthesis in C3 cereals and its contribution to grain yield: methodologies, controversies, and perspectives

Contact Info

Product

Resources

About